<template>
  <div class="tools-div">
    <el-button type="success" size="small" @click="exportData">导出</el-button>
    <el-button type="primary" size="small" @click="importData">导入</el-button>
  </div>

  <el-dialog v-model="dialogImportVisible" title="导入" width="30%">
    <el-form label-width="120px">
      <el-form-item label="分类文件">
        <el-upload
          class="upload-demo"
          action="http://localhost:8501/admin/product/category/importData"
          :on-success="onUploadSuccess"
          :headers="headers"
        >
          <el-button type="primary">上传</el-button>
        </el-upload>
      </el-form-item>
    </el-form>
  </el-dialog>

  <!---懒加载的树形表格-->
  <el-table
    :data="list"
    style="width: 100%"
    row-key="id"
    border
    lazy
    :load="fetchData"
    :tree-props="{ children: 'children', hasChildren: 'hasChildren' }"
  >
    <el-table-column prop="name" label="分类名称" />
    <el-table-column prop="imageUrl" label="图标" #default="scope">
      <img :src="scope.row.imageUrl" width="50" />
    </el-table-column>
    <el-table-column prop="orderNum" label="排序" />
    <el-table-column prop="status" label="状态" #default="scope">
      {{ scope.row.status == 1 ? '正常' : '停用' }}
    </el-table-column>
    <el-table-column prop="createTime" label="创建时间" />
  </el-table>
</template>

<script setup>
import { ref, onMounted } from 'vue'
import { FindCategoryByParentId, ExportCategoryData } from '@/api/category.js'
import { ElMessage, ElMessageBox } from 'element-plus'

////////////////////////导入
import { useApp } from '@/pinia/modules/app'

// 文件上传相关变量以及方法定义
const dialogImportVisible = ref(false)
const headers = {
  token: useApp().authorization.token, // 从pinia中获取token，在进行文件上传的时候将token设置到请求头中
}
const importData = () => {
  dialogImportVisible.value = true
}

// 上传文件成功以后要执行方法
const onUploadSuccess = async (response, file) => {
  ElMessage.success('操作成功')
  dialogImportVisible.value = false
  const { data } = await FindCategoryByParentId(0)
  list.value = data
}

///////////////////////////////////
// 定义list属性模型
const list = ref([])

// 页面初始化完毕以后请求后端接口查询数据
onMounted(async () => {
  const { code, data, message } = await FindCategoryByParentId(0)
  list.value = data
})

// 加载数据的方法
const fetchData = async (row, treeNode, resolve) => {
  // 向后端发送请求获取数据
  const { code, data, message } = await FindCategoryByParentId(row.id)

  // 返回数据
  resolve(data)
}

const exportData = () => {
  // 调用 ExportCategoryData() 方法获取导出数据
  ExportCategoryData().then(res => {
    // 创建 Blob 对象，用于包含二进制数据
    const blob = new Blob([res])
    // 创建 a 标签元素，并将 Blob 对象转换成 URL
    const link = document.createElement('a')
    link.href = window.URL.createObjectURL(blob)
    // 设置下载文件的名称
    link.download = '分类数据.xlsx'
    // 模拟点击下载链接
    link.click()
  })
}
</script>

<style scoped>
.search-div {
  margin-bottom: 10px;
  padding: 10px;
  border: 1px solid #ebeef5;
  border-radius: 3px;
  background-color: #fff;
}
.tools-div {
  margin: 10px 0;
  padding: 10px;
  border: 1px solid #ebeef5;
  border-radius: 3px;
  background-color: #fff;
}
</style>
